t: fix trivial &&-chain breakage

These are tests which are missing a link in their &&-chain,
but during a setup phase. We may fail to notice failure in
commands that build the test environment, but these are
typically not expected to fail at all (but it's still good
to double-check that our test environment is what we
expect).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7400-submodule-basic.sh

@@ -766,7 +766,7 @@ test_expect_success 'moving the superproject does not break submodules' '
 	(
 		cd addtest &&
 		git submodule status >expect
-	)
+	) &&
 	mv addtest addtest2 &&
 	(
 		cd addtest2 &&
@@ -987,7 +987,7 @@ test_expect_success 'submodule with UTF-8 name' '
 
 test_expect_success 'submodule add clone shallow submodule' '
 	mkdir super &&
-	pwd=$(pwd)
+	pwd=$(pwd) &&
 	(
 		cd super &&
 		git init &&